Unlike NovaClient or other Clients in OpenStack,
there is no space append after command in Heat Client.
That means if I try to run 'heat stack-delete', I have
to manually append the space and then append the thing
I want to delete.
This correction will help Heat Client to be more
convenient for operators.
bash_completion feature can improve CLI user experience, projects like
nova, keystone, and cinder already support it.
NOTE: this patch just provides simple functionality, which means cache
for IDs and names is not used (like nova).